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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
Aug. 31, 2015
May. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 244,623 $ 219,050
Capitalized ERP system development costs [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 18,616 $ 14,524
Capitalized ERP system development interest [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 300